Create pv_cashflow

pv_cashflow

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+from flask import Flask, render_template, request, jsonify
+import numpy as np
+import matplotlib.pyplot as plt
+
+app = Flask(__name__)
+
+def calcular_vpn(n, r, cash_flow):
+    descuento = 1 / ((1 + r) ** np.arange(1, n + 1))
+    vpn = np.sum(cash_flow * descuento)
+    return vpn
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/calcular', methods=['POST'])
+def calcular():
+    data = request.get_json()
+    n = int(data['n'])
+    r = float(data['r'])
+    cash_flow = np.array(data['cash_flow'])
+    
+    vpn = calcular_vpn(n, r, cash_flow)
+    
+    plt.figure(figsize=(10, 6))
+    plt.plot(np.arange(1, n + 1), cash_flow, marker='o')
+    plt.xlabel('Años')
+    plt.ylabel('Cash Flow')
+    plt.title('Flujo de Efectivo')
+    plt.grid(True)
+    
+    # Guardar el gráfico como imagen
+    img_path = 'static/plot.png'
+    plt.savefig(img_path)
+    
+    return jsonify({'vpn': vpn, 'plot_path': img_path})
+
+if __name__ == '__main__':
+    app.run(debug=True)